The funny thing is, for most manufacturers, the only difference between the primer and cement is PVC. PVC cement is just primer with 10-20% PVC resin dissolved in it (and a small amount of fumed silica). I don't see how primer could make a weaker solvent weld. Its just used to clean the surface. I don't know if they use mold release agent in the manufacture of PVC Pipe, but that could be another reason.
Why use purple primer on sche 40
- Thread starter Kskier
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Kingsotall
Plunger/TurdPuncher
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GabeS
Remodel Contractor
Quick question. Do you apply the glue directly after the primer is applied, or do you let it dry for a minute?
Redwood
Master Plumber
Directly afterwards. As you are applying the primer make sure the surface of the pipe and fitting is being cleaned. It will actually take the lettering right off the pipe.
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